24kv/630A Air Insulated Ring Main Unit

Product Name: 24kv/630A Air Insulated Ring Main Unit Model NO.: SM66 Current: AC Structure: Cabinet Installation: Fixed Voltage Level: Medium Voltage Shell Material: Aluminum Alloy Certification: ISO9001 Trademark: Rockwill Transport Package: Carton Specification: IEC, GB Origin: China HS Code: 8535210000 Product Description Product DescriptioniUniuswitch Air Insulation Ring Main UnitiUniswitch, the light flexible switchgear developed as amodular, simple to apply design, with fewer components, providing ahigh reliable, quality and safe product for you, our Customer. By reducing the number of components, utilising modern materials correctly, we have developed an environmentally and user friendly product. The simple design and construction of iUniswitch will stand the test of time for generations to come.iUniswitch is an air insulated (AIS), metal enclosed, switchgear cubicle design of the next generation developed through continuous innovation and vision to meet the changing market needs.iUniswitch provides long-term technical solutions for various applications. Safety, user friendliness and environmental con- cerns have been the driving force in the development of the switchgear.FeatureiUniswitch product provides our Medium Voltage Customer with the best solution for heavy duty switchgear in asize only alittle than asingle tank Ring Main Unit while including:the flexibility in meeting our Customers specification and accomodating on future change and upgradingthe options include complete control, measuring and protection systemsSwitchgear Constructionmetal enclosed switchgearBusbar compartmentThe busbar compartment is located on the top of the cubicle. This compartment contains the main busbars that intreconnect between switchgear cubicles.Switching compartmentA 3-position SF6 switch disconnector with epoxy cast resin housing is provided with inspection windows and available also with gas density indicator.Cable compartment75 %of the space in the switch disconnector cubicle is reserved for power cable connection making it possible to use both 1- and 3-phase cables with most simple unscreened terminations. Space is also adequate for cubicle accessories such as surge arresters, current transformers, second earthing switch etc. The door has an inspection window and safety interlocking as standard. For cable entry there are 3individual cable gland plates in the bottom with support for asuitable dimensioned cable clamp. The bottom and the threshold of the cubicle can be removed for ease of cable installation.Mechanism, interlocking and low voltage compartmentBehind ahinged door (which serves as control panel) are located the spring operating mechanism with position indicator and the mechanical interlocking unit. There are also facilities for cubicle accessories such as: auxiliary contacts, tripping coil, emergency tripping mechanism, capacitive voltage presence indicating system, key interlocks and motor operating device. Space is also provided for control circuits and measuring instruments as well as aprotection relay. In the 750 wide cubicles there is also asecond indentical compartment for further accessories.The upper part of the cubicle, including the busbar compart- ment, the switch disconnector and the mechanism and low voltage compartment is separated from the lower part and the cable compartment. Because of this it is possible to carry out maintenance, repair and upgrading of the unit in the lower module while the switchgear is in service.Switchgear ConstructionPrimary partTop unit3-position switch disconnector SFGOperating mechanism with mechanical position indicationEnclosure of busbar compartmentIntegrated low voltage compartment for secondary componentsInterlocking unitBusbarsControl cable ductsBottom unitEnclosureCircuit breaker (fixed version)Current transformersEarthing switchesVoltage transformersCable entry with cable supportCubicle Types /Cubicle ProgramSwitch Disconnector Cubicle, type SDCSwitch Disconnector with Fuse, type SDFCircuit Breaker Cubicle, type CBCWithdrawable Circuit Breaker cubicle, type CBWSectionalising Cubicle, type SECBus Riser Cubicle, type BRCSectionalising cubicle with Fuse, type SEFSectionalising Breaker Cubicle, type SBCDirect Busbar connection Cubicle, type DBCSectionalising Withdrawable Breaker cubicle, type SBWSectionalising Metering cubicle with Disconnector, type SMDBus Metering Cubicle, type BMCSectionalising Metering Cubicle, type SMCUniversal Metering Cubicle, type UMCTechnical dataRated voltagekV1224BILcommon valuekV75125across the isolating distance85145AC withstand voltagecommon valuekV281)50across the isolating distance321)60Rated frequencyHz50/6050/60Rated currentbusbarA630/1250630/1250feederA630/800/12504)630/12504)Rated short-time withstand currentmain circuitkA2520earthing circuitkA2520Rated peak withstand currentkA6550Rated duration of short circuits11Arc-fault current, 1skA2020Degree of protection, enclosureIP2XCIP2XCDegree of protection, partitionsIP2XIP2XAmbient temperaturemaximum value[ºC]4040maximum value of 24 h-mean+3535minimum value-53)-53)Altitude above sea level[m]<10002)<10002)1) Higher values in accordance with national standards on request2) Adjustment is necessary for greater altitudes3) Lower ambient temperature on request.4) 1250 A= CBW, SBW, BRC, DBC